This practice covers procedures for making and curing cylinder and beam specimens from representative samples of fresh concrete for a construction project. C 31/C 31M Practice for Making and Curing Concrete Test 1 This test method is under the jurisdiction of ASTM Committee C09 on. Concrete. ASTM Standards: 2. C 31/C 31M Practice for Making and Curing Concrete Test. Specimens in the Field. C 42/C 42M Test Method for Obtaining and Testing .

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You will get a representative sample of freshly mixed concrete from f truck or mixer, perform slump, temperature, and air content tests on it, and then make cylinders that will be taken back to the lab. After you rod each layer you need to tap the outside of your mold with an open hand about 10 to 15 times plastic molds may be damaged if you use awtm mallet to let excess air out of the cylinder and close the holes from rodding Adtm C31 Paragraph 9.

Strike-off Bar — Must be clean and level and must have a flat and even plane surface. Label each cylinder mold with the project number, the date and time you made the cylinder, and the sample number.

Knowing the time and date will be important for the lab tech to know when to break the cylinders.

sstm Be sure to write on your paperwork which location you aztm making or leaving your cylinders at, because someone else may be the one to come pick them up. You must have JavaScript enabled in your browser to utilize the functionality of this website. Rods – 6×12 cylinders need the large tamping rod and 4×8 cylinders need the small tamping rod.

Typically for atsm we break 2 at the seven day mark and 2 at the 28 day mark and leave a spare cylinder to break on the 56 day mark if the cylinders have still failed to meet the required strength. Report the following for each sample brought into the laboratory: ComScore is a media measurement and analytics company providing marketing data and analytics to enterprises, media and advertising agencies, and publishers.


If you are rodding the cylinders to consolidate them, the amount of layers will vary ashm sample size: Specimens should be shielded from direct sunlight or radiating heating devices, if used.

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ASTM C31 / C31M – 18b Standard Practice for Making and Curing Concrete Test Specimens in the Field

When strength is used as a basis for acceptance of concrete, specimens must be molded and cured according to ASTM C Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided ast part of the standard. After you have consolidated the concrete, you will need to strike off the concrete to provide a smooth surface.

When you sample the concrete, try to get adtm sample from the middle of the batch and not the first or last clumps of concrete, because the first or last portions may come out of the mixer slightly different from the rest of the batch. This service allows you to sign up for or associate a Google AdSense account with HubPages, so that asgm can earn money from ads on your articles.

Asfm many inches are in one layer of a concrete test specimen? Unless you are signed in to a HubPages account, all personally identifiable information is anonymized. This is used to provide sstm on traffic to our website, all personally identifyable data is anonymized. To strip a cylinder, insert the stripping tool into the top of the mold in the gap between the concrete and the mold, and hammer it all the way to the bottom of the mold.

You can use this to streamline signing up for, or signing in to your Hubpages account. Set them on the floor or on the table, whichever you prefer, and grab a stripping tool looks like a t-shaped metal bar and a rubber mallet.

You will know when the vibration is done when the surface of the concrete is relatively smooth and air bubbles have stopped coming up to the top surface. This is used to detect comment spam. This is a cloud CDN service that we use to efficiently deliver files required for our service to operate such as javascript, cascading style sheets, images, and videos.


They need time to cure under moist temperature-controlled conditions and they do not need to be overly exposed to the elements. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

ASTM C31 – Making and Curing Concrete Test Specimens in the Field

Concrete cylinder samples are made for your lab technician to break in a hydraulic press machine and find the compressive strength of the concrete that is being poured for a specific part of a structure.

Ours has shelves labeled with a date, and we store them on the day they are meant to be broken, not the day they were made. Cylinders shall have free water maintained on their surfaces at all times and remain in a constant temperature of Protect the surfaces of both in the same manner the structure is protected, as best as possible. Step 3 For rodding, see 3A. Also prevent moisture loss by wrapping specimens in wet burlap or plastic, if not contained in plastic already.

ASTM C31 – Making & Curing Concrete Specimens in the Field

Google provides ad serving technology and runs an ad network. These samples provide quality control for architects and engineers and allow them to determine if they will be able to put that concrete into service for their structure, or if they need to remove what they have poured.

Drive carefully, these are the only samples you’ve got. The ultimate goal of the sampling process is to have a sample that is an average representation of what is going into the pour, to get the most accurate strength value in the lab.

Use a back-and forth left-to-right sawing motion, starting in the middle and working away from you, then come back to the middle and move the strike-off bar towards you, still performing the same sawing motion.